From: "Christian Schaubschläger" <christian.schaubschlaeger@gmx.at>
To: kexec@lists.infradead.org
Cc: Khalid Aziz <khalid.aziz@hp.com>,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: Problem with kexec on i386, linux-3.5
Date: Thu, 16 Aug 2012 14:41:55 +0200 [thread overview]
Message-ID: <502CEA93.7090808@gmx.at> (raw)
In-Reply-To: <87sjbqjgi8.fsf@xmission.com>
> That is a tricky issue. Sometimes the slightest things can set
> something like this off.
>
> Somewhere someone changed something in one of the drivers that made it
> so that the hardware winds up in a state the int 13 disk driver does not
> like it after kexec.
> .
> If you want to track this down I would recommend a bisect between 3.4
> and 3.5-rc1 to see which change breaks your setup.
I bistcted that down to this patch:
commit b566a22c23327f18ce941ffad0ca907e50a53d41
Author: Khalid Aziz <khalid.aziz@hp.com>
Date: Fri Apr 27 13:00:33 2012 -0600
PCI: disable Bus Master on PCI device shutdown
Disable Bus Master bit on the device in pci_device_shutdown() to ensure PCI
devices do not continue to DMA data after shutdown. This can cause memory
corruption in case of a kexec where the current kernel shuts down and
transfers control to a new kernel while a PCI device continues to DMA to
memory that does not belong to it any more in the new kernel.
I have tested this code on two laptops, two workstations and a 16-socket
server. kexec worked correctly on all of them.
Signed-off-by: Khalid Aziz <khalid.aziz@hp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Without this patch, int13 works fine here! If anyone needs more information, just let me know!
Greetings,
Christian
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next prev parent reply other threads:[~2012-08-16 12:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-24 17:49 Problem with kexec on i386, linux-3.5 Christian Schaubschläger
2012-08-14 3:31 ` Eric W. Biederman
2012-08-16 12:41 ` Christian Schaubschläger [this message]
2012-08-16 19:22 ` Eric W. Biederman
2012-08-17 6:58 ` Christian Schaubschläger
2012-09-07 15:16 ` Khalid Aziz
2012-09-07 20:29 ` Khalid Aziz
2012-09-10 6:00 ` Christian Schaubschläger
2012-09-10 16:29 ` Khalid Aziz
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